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Finding the Fourth Proportional to 770.49, 1,061.11 and 721.08

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Solution

The fourth proportional to 770.49, 1,061.11 and 721.08 is: 993.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.49 : 1,061.11 = 721.08 : x
  2. Step 2: Convert to fraction form
    770.49/1,061.11 = 721.08/x
  3. Step 3: Cross multiply
    770.49x = 1,061.11 × 721.08
  4. Step 4: Simplify right side
    770.49x = 765,145.20
  5. Step 5: Solve for x
    x = 765,145.20/770.49
  6. Step 6: Final answer
    x = 993.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.